DC Generators
When two D.C. series generators are running in parallel, an equalizer bar is used

To reduce the combined effect of armature reaction of both machines
To increase the speed and hence generated e.m.f.
So that two similar machines will pass approximately equal currents to the load
To increase the series flux

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DC Generators
Inter-pole flux should be sufficient to

Neutralize the armature reaction flux
None of these
Neutralize the commutating self induced e.m.f.
Neutralize both the armature reaction flux as well as commutating e.m.f. induced in the coil

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